Brush



-KEN NEDY 2,273,278

Feb. 17, 1942.

C. J. H. MACKENZIE BRUSH Filed Feb. 8, 1959 2 Sheets-Sheet l Feb. 17, 19.42.

C. J. H. MACKENZIE-KENNEDY BRUSH Filed Feb. 8, 1939 2 Sheets-Sheet 2 C/wjybo/"ough J H. Mackenzie%enndy Patented Feb. 17, 1942 UNITED STATES PATENT OFFICE BRUSH Chessborough J. H. Mackenzie-Kennedy, New

York, N. Y.; Betty Mackenzie-Kennedy, New York, N. Y., administratrix of said Chessborough J. H. Mackenzie-Kennedy,deceased Application February 8, 1939, Serial No. 255,323 5 Claims. (Cl. 15-467) This invention relates to brushes such as tooth brushes and the like and has for its purpose to provide a novel tuft arrangement whereby improved bristle action is afforded. This object is attained by so angling the tufts relative to the brush head or stock that, in the full realization of the invention, some of the bristles will always be at a positive angle to the surface operated on regardless of the direction of movement of the brush and without rocking or tilting the brush. Moreover, a compact tuft arrangement, with mutual support of the tufts in use, is provided.

In the accompanying drawings, I have shown the invention as embodied in a tooth brush and specific description of the underlying principles will be made with reference to these drawings, in which:

Figure l is a plan view of the new brush in a desirable actual size.

Figure 2 is an elevation of the brush of Figure 1.

Figure 3 is a section substantially on line 33 of Figure 4.

Figure 4 is a plan view of the brush head of Figure 1 considerably enlarged and with the tufts outlined in dotted lines.

Figure 5 is a section substantially on line 55 of Figure 3.

Figure 6 is a section substantially on line 6-6 of Figure 3.

Figure '7 is a section substantially on line I-'! of Figure 3.

Figure 8 is a section substantially on line 8-8 of Figure 9, and

Figure 9 is a plan view of a brush head comprising a separable stock, the stock being provided with tuft receiving bores angled as in the first embodiment.

Referring first to Figures 1 to 7, reference numeral I designates a handle portion and reference numeral II a head portion. The two portions, as here shown, are formed integrally but may be hinged together for the sake of compactness if desired. Mounted in the head portion, in bores formed in the latter, are the tufts, generally indicated at l2.

The tufts are arranged in two outside rows, one of which starts at I3 and ends at I4 and the other of which starts at I and ends at I6, these rows of tufts being arranged in bores starting at I3 and ending at I4 and bores starting at I5 and ending at l6, as most clearly shown in Figure 4. The bores I3 to I4 are inclined at equal angles rearwardly (i. e., toward the handle) and inwardly, and the bores I5 and l6 inclined at the same angles rearwardly and inwardly. Bore I3. is directly opposite I5 and so forth throughout the two series.

Inner rows of tufts extend on the one side from tuft I! to tuft I8 and on the other side from tuft I9 to tuft 20. These tufts are mounted in bores IT to Hi and from I9 to 20', and all of these bores are inclined forwardly of the head at preferably the same angles.

The end tufts I8 and 20 of the inner rows constitute a transverse row by themselves, and their bores I8 and 20 are in a transverse line parallel to the line of bores I4 and I6. For the rest, the bores of the inner rows are in transverse alignment with the bores of the outer rows. I

Between tufts I3 and I5 is a tuft 2| mounted in a bore 2| which is forwardly inclined in the manner of bores I'I, I9, etc. A terminal group of bristles 22 and 23 is mounted in bores 22 and 23' which are rearwardly inclined in the manner of bores I3 and I5, etc.

It will be evident that by reason of the angling of the bores the tufts mounted therein will be inclined from base to tip relative to the head portion.

The tuft 2| is staggered relative to the tufts 22 and 23, and due to its reverse inclination as compared to the latter and due to the relative heights of the tufts, its expanded upper end is substantially engaged between the expanded upper ends of tufts 22 and 23. The same applies with respect to the inner rows of tufts in their relation to the outer rows of tufts. The inner rows are of such adjacency and the expanded upper portions of the tufts of such size that the latter bear against each other as particularly indicated in Figure 4, so that taken all together, a solid bristle arrangement is afforded.

If the brush is moved to the left, it will be seen that the inner rows of tufts and the tuft 2| will, in ordinary use, have a positive angle with respect to the surface operated on, whereas when the brush is moved to the right, the outer rows of tufts and the end group 22 and 23 will have a positive angle with respect to the surface. By positive angle, I mean an angle formed when the outer ends of the tuft axes are in advance of their lower ends. Assuming the brush to be moved laterally, one or the other of the outside rows of tufts will be at a positive angle to the surface. In fact, the peripheral system of tufts, including the outer rows and the end tufts I8, 20 and 22, 23, will of itself provide some tufts always at a positive angle, regardless of the di are also rection of movement of the brush head.

The bores are desirably at an angle of five degrees from the normal, and by this I mean that they are inclined at about five degrees from lines perpendicular to the fiat face, as here shown, of the head. However, the leading group 22 and 23 may also be slightly divergent upwardly, each tuft being inclined at, for example, about two degrees from the normal, as shown in Figure 5. The tufts of the inner longitudinal rows might similarly be somewhat outwardly divergent.

Furthermore, the length of the tufts may increase away from the handle up to and including tufts l3, l5 and 2|, with the terminal group 22 and 23 somewhat shorter, as indicated in Figures.

2 and 3. The trimming of the tuft ends may be as shown. The details of tuft form, relative arrangement, and angling, may, however, be varied as desired.

In Figures 8 and 9, the head includes an oblong loop-like portion 24, having transversely tapered inner surfaces as at 25, and a brush blockor portion 26. shaped and peripherally tapered for a edge fit throughout with the inner surfaces of por ion 24. It will be seen that pressure on the bristle ends in use will tend to force the parts together although the stock may be easily removedv for replacement. It will be seen that the bores.

are designed to accommodate the same tuft arrangement hereinbefore described.

It will be understood that variations in detail may be made without departure from the invention as defined in the following claims.

I claim:

1. A brush of'the class described comprising a head portion and bristle tufts mounted in said head portion, said tufts being arranged in outer rows and inner rows extending longitudinally of the head portion, the mounting of the tuftsbeing such that the tufts of the inner rows are. in-

clined in one direction longitudinally of the head portion and the tufts of the outer rows are oppositely inclined.

2. A brush of the class described comprising a head portion and bristle tufts mounted in said head portion, said tufts being arranged in outer rows and inner rows extending longitudinally of the head portion, the mounting of the tufts being such that the tufts of the inner rows are inclined in one direction longitudinally of the head portion and the tufts of the outer rows are oppositely inclined and are also inclined toward each other.

3. A brush according to claim 1 wherein the ends of the tufts of the inner rows are staggered with theends of the tufts of the outer rows and are received to a substantial extent between the latter.

4. A brush according to claim 1 wherein a group of tufts is provided at one end of the inner rows. of tufts. and. so mounted as to be inclined oppositely to. the latter.

5.v A brush of the class described comprising a head and rows of bristle tufts mounted in said headand extending longitudinally thereof, said rows being uninterrupted and extending side by side, the tufts of each row being all effective upon brushing movement of the head with normalpressure, the tufts of one of said rows being all so mounted as to be inclined rearwardly of said head and the tufts of the other of said rows being all so mounted as to be inclined forwardly of said head, said rows of tufts being inclined toward each other, the ends of the tufts of one row being staggered with the ends of the tufts 

